No credit on invoices - handed over with costs charged for no service

My issue started in November 2016. Orders got invoiced that were not in my box. I have sent a picking slip to Avon and no credit was made on my account. December 2016 I had the same issue, no orders in my box and no credit. I then stopped with the sales in order to query the picking slips from Avon. Its all good to make sales but when **** hits the fan Avon disappears. I was told that there were no signatures on the slips. However, the picking slip for November had a signature and it was not credited so I assumed signature was not needed for December either..,little did I know that Avon would not have answers and they would rather blame me for sending the picking slips in wrong and without the signatures from my Regional manager and my Team leader. After months of no answers I refused to pay the account. Avon then hands my account over to ITC-BA where costs get added to my account for **** I did not receive. No letters, no SMS's and no answers from ITC-BA as to why. When I called to query this in October, Avon gives me a different amount to what ITC-BA gave me. I request that Avon fixes my damn account and lifts the suspension on my account ASAP! I am not paying a damn cent until I get answers